Process for the preparation of dicidal

1 . Process comprising the process steps of:

a) initially charging dicyclopentadiene;

b) adding a compound of formula (I):

where R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 are selected from: —H, —(C 1 -C 12 )-alkyl, -Ph;

c) adding a Pt compound capable of forming a complex;

d) adding an iodine compound;

e) feeding in CO and H 2 ;

f) heating the reaction mixture from steps a) to e), to convert the dicyclopentadiene to dicidal.

2 . Process according to claim 1 ,

where R 1 and R 4 are —H.

3 . Process according to claim 1 ,

where R 5 , R 6 , R 7 , R 8 are -Ph.

4 . Process according to claim 1 ,

where R 2 and R 3 are —(C 1 -C 12 )-alkyl.

5 . Process according to claim 1 ,

where R 2 and R 3 are —CH 3 .

6 . Process according to claim 1 ,

wherein the compound (I) has the structure (1):

7 . Process according to claim 1 ,

wherein the Pt compound is selected from: Pt(II)I 2 , Pt(IV)I 4 , diphenyl(1,5-COD)Pt(II), Pt(II)(acac) 2 , Pt(0)(PPh 3 ) 4 , Pt(0)(DVTS) solution (CAS: 68478-92-2), Pt(0)(ethylene)(PPh 3 ) 2 , tris(benzylideneacetone)Pt(0), Pt(II)(OAC) 2 solution, Pt(0)(t-Bu) 2 , Pt(II)(COD)Me 2 , Pt(II)(COD)I 2 , Pt(IV)IMe 3 , Pt(II)(hexafluoroacetylacetonate) 2 .

8 . Process according to claim 1 ,

wherein the iodine compound is selected from: Pt(II)I 2 , LiI.

9 . Process according to claim 1 ,

wherein PtI 2 is added in an amount, measured in mol % based on dicyclopentadiene, such that the value is in the range from 0.1 mol % to 5 mol %.

10 . Process according to claim 1 ,

comprising the additional process step e′):

e′) adding a solvent.

11 . Process according to claim 1 ,

wherein CO and H 2 is fed in at a pressure in a range from 1 MPa (10 bar) to 6 MPa (60 bar).

12 . Process according to claim 1 ,

wherein the reaction mixture is heated to a temperature in the range from 25° C. to 150° C.

13 . Process according to claim 1 ,

wherein the process comprises the additional process step g):

g) converting dicidal to dicidol.

14 . Process according to claim 13 ,

wherein the conversion of dicidal to dicidol is carried out using “Shvo's catalyst” (CAS 104439-77-2).